Use (i|f|o)accept chains in user's defined firewall rules

To be able to analyse the traffic
Merge pull request #601 from Zentyal/ejhernandez/fix-ips-behind

Use (i|f|o)accept chains in user's defined firewall rules
Merge branch '3.0'

Conflicts:
	main/firewall/ChangeLog
Fix samba antivirus
fixed changelog indentation/typos
Merge pull request #602 from Zentyal/scabrero/samba-fix-antivirus

Fix samba antivirus
depend on samba 4.1.0rc2-zentyal9
releasing captiveportal 3.1.5
releasing core 3.1.9
releasing dhcp 3.1.3
releasing dns 3.1.4
releasing firewall 3.1.5
releasing ips 3.1.4
releasing jabber 3.1.3
releasing monitor 3.1.3
releasing remoteservices 3.1.7
releasing samba 3.1.9
releasing webmail 3.1.2
Adapted mailfilter-ldap script to the new users API
Fix previous commit